分析了井下无线电波传播特性,指出井下无线通信受阻的根本原因在于存在各种衰落,主要是多径衰落,根据扩频通信、分集接收等理论,论述了CDMA通信系统抗多径衰落及其他干扰的能力,指出多径分集接收技术(RAKE接收技术)特别适用于环境恶劣和复杂的煤矿井下,仿真结果表明,RAKE接收能有效地减小多径衰落的影响.%This paper analyzes the underground radio wave propagation characteristics of underground wireless communication,and points out that main hindered decay cause of the underground radio wave propagation results from multipath fading. According to spread spectrum communication,diversity reception theory.it also discusses the CDMA communication system multipath anti-fading and other anti-interference ability and puts forward that spread spectrum communication with RAKE receiving technology applies to underground coal mine specially. The simulation results show that RAKE reception can effectively reduce the influence of multipath fading.
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